Cutting device for container coverings

Abstract

The present invention discloses a container cover produced from a plastics film, having a rotating closure which has a rotatable cylindrical cutting device (100, 300), wherein the latter has a lower rim (110) on which at least one cutting edge section (120) is arranged, and wherein said at least one cutting edge section (120) has at least three teeth (130) which are located on a line extending in an inclined manner in relation to the bag, and wherein the front-most tooth in the direction of rotation comes first into contact with the plastics film during the cutting operation. The cutting device (100, 300) is characterized in that the inclination of the line on which the teeth (130) of each cutting edge section are located is selected such that, in the case of at least approximately maximum deformation of the plastics film before the latter is perforated by the front-most tooth, at least two following teeth of the same cutting edge section (120) are in direct contact with the plastics film.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a cutting device for cutting through a container covering which consists of plastic, paper, cardboard, light metal or laminated layers made from at least two of the aforementioned materials.[0002]Known cutting devices for cutting through a container covering as disclosed, for example, in EP 1 396 436 comprise a cutting element which is mounted screw-like in the closure cap and is movable in the direction of the container covering, the cutting edge of said cutting element having at least a number of teeth extending along the cutting edge in the direction which is opposed to the direction of rotation. The teeth are arranged such that they gradually increase in height along the direction of rotation, such that the distance between the teeth and the container covering decreases in the direction of rotation. As a result, the frontmost tooth in the direction of rotation has the highest tooth tip and thus is the first to pie...

AI Technical Summary

Benefits of technology

The present invention provides a cutting device that requires less torque to apply and eliminates the need for attachment to a cuttable material, resulting in lower production costs for the container covering and the cutting device.

Problems solved by technology

Accordingly, in the course of the cutting operation through the container covering, the high forces act mainly on the frontmost blade, causing a blunting of said blade in the course of the cutting operation and thus a reduction of the cutting efficiency.

Moreover, these comparatively high forces mainly occurring on the frontmost blade of the cutting device may lead to an unintended flexing or bending of the frontmost tooth of the cutting device in relation to the container covering and thus to a reduction of the cutting efficiency, this in turn resulting in an increase in torque that has to be applied.

This causes a frayed cut line, as a result of which the pouring stream is impeded or deflected when exiting, and the contents are accordingly partially spilt.

Moreover, these fibers may detach themselves from the container covering and fall into the interior of the container covering in an uncontrolled manner.

The disadvantages of the known cutting devices which have been mentioned up to this point have been known to the person skilled in the art for years.

However, in most cases the aforementioned density and / or thickness of such cuttable materials is not sufficient to allow the contents in the container coverings made of pure plastic film to be stored reliably in a lasting manner.

In other words, material which can be cut using known cutting devices may tear relatively easily and / or actually burst under pressure prevailing in the course of usage.

This material, however, could not be cut open with the known cutting devices.

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